ActivityImmediate PredecessorOptimisticMost ProbablePessimisticA$356$B$246$CA$,$ B$456$DA$,$ B$689$EB$246$FC$123$GD$4911$HD$,$ F$7911$IE$,$ G$,$ H$345$

$($a$)$

What are the critical activities? $($Enter your answers as a comma$-$separated list.$)$

$$A$,$ D$,$G$,$H$,$ I

$($b$)$

What is the expected time $($in days$)$ to complete the project? $($Round your answer to two decimal places.$)$

$50\mathrm{.}00$ days

$($c$)$

Based only on the critical path, what is the estimated probability that the project can be completed in $25$ or fewer days?